src/test/compile-fail/borrowck/borrowck-assign-to-constants.rs

// Copyright 2012 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.

// revisions: ast mir
//[mir]compile-flags: -Z borrowck=mir

static foo: isize = 5;

fn main() {
    // assigning to various global constants
    foo = 6; //[ast]~ ERROR cannot assign to immutable static item
             //[mir]~^ ERROR cannot assign to immutable static item `foo`
}